<!--
  多图上传组件
  @author: youlaitech
  @date 2022/11/20
-->

<template>
  <el-upload
    v-model:file-list="fileList"
    list-type="picture-card"
    :before-upload="handleBeforeUpload"
    :http-request="handleUpload"
    :on-remove="handleRemove"
    :on-preview="previewImg"
    :limit="props.limit"
  >
    <i-ep-plus />
  </el-upload>

  <el-dialog v-model="dialogVisible" title="查看图片">
    <div class="dialog__body__container">
      <el-image
        style="width: 100%; height: auto"
        :src="previewImgUrl"
        :zoom-rate="1.2"
        :max-scale="7"
        :min-scale="0.2"
        :preview-src-list="[previewImgUrl]"
        :initial-index="4"
        fit="cover"
        alt="Preview Image"
      />
    </div>
  </el-dialog>
</template>

<script setup lang="ts">
import {
  UploadRawFile,
  UploadRequestOptions,
  UploadUserFile,
  UploadFile,
  UploadProps,
} from "element-plus";
import { uploadFileApi, deleteFileApi } from "@/api/file";

const emit = defineEmits(["update:modelValue"]);

const props = defineProps({
  /**
   * 文件路径集合
   */
  modelValue: {
    type: Array<string>,
    default: () => [],
  },
  /**
   * 文件上传数量限制
   */
  limit: {
    type: Number,
    default: 10,
  },
});

const previewImgUrl = ref("");
const dialogVisible = ref(false);

const fileList = ref([] as UploadUserFile[]);
watch(
  () => props.modelValue,
  (newVal: string[]) => {
    const filePaths = fileList.value.map((file) => file.url);
    // 监听modelValue文件集合值未变化时，跳过赋值
    if (
      filePaths.length > 0 &&
      filePaths.length === newVal.length &&
      filePaths.every((x) => newVal.some((y) => y === x)) &&
      newVal.every((y) => filePaths.some((x) => x === y))
    ) {
      return;
    }

    fileList.value = newVal.map((filePath) => {
      return { url: filePath } as UploadUserFile;
    });
  },
  { immediate: true }
);

/**
 * 自定义图片上传
 *
 * @param params
 */
async function handleUpload(options: UploadRequestOptions): Promise<any> {
  try {
    // 上传API调用
    const { data: fileInfo } = await uploadFileApi(options.file);
    console.log("上传成功啦  ", fileInfo);
    // 上传成功需手动替换文件路径为远程URL，否则图片地址为预览地址 blob:http://
    const fileIndex = fileList.value.findIndex(
      (file) => file.uid == (options.file as any).uid
    );

    fileList.value.splice(fileIndex, 1, {
      name: fileInfo.name,
      url: fileInfo.fullurl,
    } as UploadUserFile);

    emit(
      "update:modelValue",
      fileList.value.map((file) => file.url)
    );
  } catch (error) {
    ElMessage({
      type: "error",
      message: "请上传图片",
    });
  }
}

/**
 * 删除图片
 */
function handleRemove(removeFile: UploadFile) {
  // 删除成功回调
  emit(
    "update:modelValue",
    fileList.value.map((file) => file.url)
  );
  console.log("图片删除啦");
  // const filePath = removeFile.url;

  // if (filePath) {
  //   deleteFileApi(filePath).then(() => {
  //     // 删除成功回调
  //     emit(
  //       "update:modelValue",
  //       fileList.value.map((file) => file.url)
  //     );
  //   });
  // }
}

/**
 * 限制用户上传文件的格式和大小
 */
function handleBeforeUpload(file: UploadRawFile) {
  if (file.size > 2 * 1048 * 1048) {
    ElMessage.warning("上传图片不能大于2M");
    return false;
  }
  return true;
}

/**
 * 预览图片
 */
const previewImg: UploadProps["onPreview"] = (uploadFile) => {
  previewImgUrl.value = uploadFile.url!;
  dialogVisible.value = true;
};
</script>

<style lang="scss" scoped>
.dialog__body__container {
  padding-right: 15px;
  max-height: 68vh;
  overflow: auto;
}
</style>
